|Publication number||US7289822 B2|
|Application number||US 11/156,033|
|Publication date||Oct 30, 2007|
|Filing date||Jun 16, 2005|
|Priority date||Jun 21, 2004|
|Also published as||CN1994008A, CN1994008B, CN101931892A, CN101931892B, US20050288048, WO2006002266A1|
|Publication number||11156033, 156033, US 7289822 B2, US 7289822B2, US-B2-7289822, US7289822 B2, US7289822B2|
|Inventors||Eric C. Rosen, Harleen K. Gill, Arulmozhi Kasi Ananthanarayanan, Ashu Razdan|
|Original Assignee||Qualcomm Incorporated|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (6), Referenced by (7), Classifications (9), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/581,968, filed on Jun. 21, 2004; and U.S. Provisional Patent Application Ser. No. 60/686,147, filed on May 31, 2005. The contents of these documents are incorporated herein by reference.
1. Field of the Invention
The invention relates to data transfer in a wireless telecommunication system and, more particularly, the identification of data type transferred within a wireless telecommunication system.
2. Description of the Related Art
In wireless telecommunication systems, Push-to-talk (PTT) capabilities are becoming popular with service sectors. PTT can support a “dispatch” voice service that operates over standard commercial wireless infrastructures, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), and global system for mobile communications (GSM). In a dispatch model, communication between endpoints (end user devices) occurs within virtual groups, wherein the voice of one “talker” is broadcast to one or more “listeners.” A single instance of this type of communication is commonly referred to as a dispatch call, or simply a PTT call. A PTT call is an instantiation of a group, which defines the characteristics of a call. A group in essence is defined by a member list and associated information, such as group name or group identification. In the absence of a wireless multicast channel, each group is formed by the combination of separate point-to-point connections between each endpoint and PTT servers manage the call. Each endpoint is also known as a client.
The PTT server 112 handles PTT communications among members of a PTT group. The PTT server 112 receives a PTT communication from one member and forwards it to all members of the PTT group. The PTT communication is usually received as data packets from the network 110, and the PTT communication sent out by the PTT server 112 are also in data packet format. A receiving mobile switching center (MSC) and a connected base station (BS) then established a dedicated channel to transmit the PTT communication to a receiving mobile client (a PTT member).
After the PTT server 112 sends the announce call messages, each announce call message is received by a MSC and forwarded by the MSC to a BS. The BS broadcasts the announce call message. If a mobile client who is a targeted receiver is available, the mobile client sends an accept call message back to the PTT server 112. After receiving the accept call message from at least one mobile client, the PTT server 112 sends a floor grant message back to the originating mobile client. There may be more than one targeted user in the originator's PTT communication group, and the PTT server 112 will grant the floor to the originator if there is at least one targeted mobile client available. After receiving the floor grant message, the PTT requesting mobile client (originator) can then make a PTT communication.
The PTT communication set up process described above is time sensitive and the initial PTT latency shown in
The apparatus and method of the invention enables fast response to PTT related inputs from a PTT communication user. In one embodiment, there is provided a method for enabling fast set up of a push-to-talk communication between a mobile device and a wireless communication network, wherein the mobile device communicates with the wireless communication network through signaling channels and data channels. The method includes receiving at radio signal transmission point a data packet containing a PTT message from a data communication network, checking the data packet, and, if the PTT message in the data packet is a set up related message, transmitting the PTT message to the mobile device through a signaling channel.
In another embodiment, there is provided a method for enabling fast set up of a push-to-talk communication between a mobile device and a wireless communication network, wherein the mobile device communicates with the wireless communication network through signaling channels and data channels. The method includes receiving at the mobile device a PTT communication request, and transmitting a PTT message through a signaling channel to a radio transmission point, the radio transmission point being in communication with a PTT server.
In yet another embodiment, there is provided an apparatus for enabling fast set up of a push-to-talk (PTT) communication between a mobile device and a wireless communication network, wherein the apparatus is in communication with the mobile device through signaling channels and data channels. The apparatus includes a network interface unit for receiving a PTT message from a data network, a storage unit for storing the PTT message, a controller unit for analyzing the PTT message, and a radio interface unit for transmitting the PTT message via radio signal to a mobile device. If the PTT message in the storage unit is a set up related message, the radio interface unit transmits the PTT message to the mobile device through a signaling channel.
In yet another embodiment, there is provided an apparatus for enabling fast set up of a push-to-talk (PTT) communication between a mobile device and a wireless communication network, wherein the apparatus is in communication with the mobile device through signaling channels and data channels. The apparatus includes a user interface for receiving a PTT message with a user, a storage unit for storing the PTT message received from the user, a controller unit for analyzing the PTT message stored in the storage unit, and a transceiver unit for transmitting the PTT message through a signaling channel to the wireless communication network.
The present apparatus and methods are therefore advantageous as they enable a wireless communication device to give priority to PTT call set up related messages. Through using the signaling channel for transferring PTT call set up related messages, the latency of a PTT call can be reduced.
Other advantages and features of the present invention will become apparent after review of the hereinafter set forth Brief Description of the Drawings, Detailed Description of the Invention, and the claims.
In this description, the terms “communication device,” “wireless device,” “wireless communications device,” “PTT communication device,” “handheld device,” “mobile device, and “handset” are used interchangeably. The term “application” as used herein is intended to encompass executable and nonexecutable software files, raw data, aggregated data, patches, and other code segments. The term “exemplary” means that the disclosed element or embodiment is only an example, and does not indicate any preference of user. Further, like numerals refer to like elements throughout the several views, and the articles “a” and “the” includes plural references, unless otherwise specified in the description.
In overview, the system and method enables fast set up for a push-to-talk (PTT) communication between a wireless device and a wireless communication network. Normally, when a wireless device is ready to transmit a PTT communication to a base station (BS), the wireless device sends a channel request to the BS through a signaling channel to effect the establishment of a dedicated channel. The BS will establish a reverse access channel and the wireless device will then transmit the PTT communication over the reverse access channel to the BS. Similarly, when the BS is ready to transmit a PTT communication to the wireless device, the BS broadcasts a paging message through the signaling channel to the wireless device. After the wireless device acknowledges the paging message, the BS establishes a forward access channel to the wireless device and transmits the PTT communication through the forward access channel to the wireless device. The set up process for the PTT communication can sped up by transmitting set up related PTT messages through the signaling channel, instead of waiting for connecting to a dedicated access channel.
The wireless device may also transmit a PTT set up request message to the BS independent of any action from the user. When the wireless device is powered up, the wireless device may receive a PTT call announce message from the BS. In response to the PTT call announce message, the controller unit 402 generates a PTT accept call message, and the transceiver unit 410 embeds the PTT accept call message in a signaling message and sends it through the signaling channel back to the BS.
If the PTT input is a call announcement, step 508, from the base station, the wireless device generates a call accept message, step 510, and transmits the call accept message back to the base station through the signaling channel, step 512. By transmitting the call accept message through the signaling channel back to the base station, which forwards it to the PTT server, instead of sending it through a dedicated reverse channel, the PTT server can grant the floor faster to a PTT call originating wireless device. The PTT process will also process other PTT related inputs, step 514.
If the received PTT message is not a PTT call set up message, the PTT server checks whether the PTT message is a call accept message from a wireless device, step 614. If the PTT message is a call accept message, the PTT server identifies the user who requested the PTT call, step 618, and checks whether a floor grant message has been sent to the requesting user, step 620. The user may use the PTT feature to communicate with more than one PTT member, and consequently more than one call accept message may be received by the PTT server. If the PTT server has not sent any floor grant message to the requesting user, i.e., the received call accept message is the first call accept message, the PTT server generates a floor grant message, step 622, and marks the header of the floor grant message specially, step 624, to denote it as a call set up related message. The specially marked floor grant message is sent as a data packet to a base station, step 626, which in turn will transmit to the requesting wireless device. If a floor grant message has already been sent to the requesting wireless device, then the PTT server will not send another floor grant message to the same requesting wireless device. The PTT server will also handle other PTT related messages, step 616.
The data packets with special headers are handled differently by a base station.
The following is a use scenario illustrating the invention. When a user desires to communicate via the PTT feature with members of a PTT group that includes his co-workers at a construction site, the user pushes the PTT button on his wireless device. The wireless device detects the activation of the PTT button, generates a call request message, and sends the call request message to a PTT server. The call request message is a call set up message and the wireless device will transmit it as a signaling message through a signaling channel to a base station. By transmitting the call request message through the signaling channel, the call request message can be received sooner by the PTT server. The base station receives the signaling message and forwards it to the PTT server.
The PTT server receives the call request message, identifies the requesting user and the PTT group to which he belongs. The PTT server also identifies the members of this PTT group and generates a PTT call announce message to each member. The PTT call announce message is sent to a base station as a data packet with a header that is specially marked. The base station receives this PTT call announce message and sees it is a special data packet. The base station then, instead of establishing a dedicated channel to a targeted wireless device of a PTT member, embeds the PTT call announce message in a signaling message and transmits it via a signaling channel to the targeted wireless device.
If the targeted wireless device is available, it will respond to the PTT call announce message with a call accept message. The targeted wireless device transmits the call accept message via a signaling channel back to the base station. The base station forwards the call accept message in a data packet to the PTT server. After receiving the first call accept message, the PTT server grants the floor to the requesting wireless device and sends a floor grant message to the requesting wireless device. The floor grant message is sent as a data packet with a special header and destined to the requesting wireless device.
The floor grant message is received by the base station serving the requesting wireless device, and the base station checks the data packet's header. Upon realizing it is a special marked data packet, the base station embeds the floor grant message in a signaling message and transmits the message via a signaling channel to the requesting wireless device. When the requesting wireless device receives the floor grant message, it notifies the user that it is ready to receive any message the user wants to send to other PTT members.
By transmitting call request, call accept, and other call set up related messages through a signaling channel instead of requesting and waiting for a dedicated channel be set up, a PTT system can enable a fast response to PTT related requests from a user and thus making use of the PTT feature more pleasant to the user.
In view of the method being executable on a wireless service provider's computer device or a wireless communications device, the method can be performed by a program resident in a computer readable medium, where the program directs a server or other computer device having a computer platform to perform the steps of the method. The computer readable medium can be the memory of the server, or can be in a connective database. Further, the computer readable medium can be in a secondary storage media that is loadable onto a wireless communications device computer platform, such as a magnetic disk or tape, optical disk, hard disk, flash memory, or other storage media as is known in the art.
In the context of
While the invention has been particularly shown and described with reference to a preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the present invention as set forth in the following claims. For example, the description above is based on an audio PTT communication, it is understood the apparatus, system, and method can be easily modified to support other type of media, such as video, data, etc. Furthermore, although elements of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
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|U.S. Classification||455/518, 455/517, 455/516|
|International Classification||H04B7/00, H04W84/08, H04W4/10|
|Cooperative Classification||H04W4/10, H04W76/005|
|Sep 6, 2005||AS||Assignment|
Owner name: QUALCOMM INCORPORATED, CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ROSEN, ERIC D.;GILL, HARLEEN K.;ANANTHANARAYANAN, ARUL;AND OTHERS;REEL/FRAME:016730/0357;SIGNING DATES FROM 20050829 TO 20050830
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